Mariah Carey is in the doghouse with a veterinarian who says the pop superstar hasn't paid nearly $30,000 in bills for three of her prized pooches. Veterinarian Cindy Bressler sued Carey on Wednesday in a Manhattan state court. Bressler provided “extraordinary services” for the Jack Russell terriers - Cha-Cha, Dolomite and JJ - but the Grammy Award-winning singer paid only about $8,200 of the roughly $37,800 in charges, the lawsuit says. The bills cover a little more than a month of care. The pop diva has made her dogs something of characters in her multiplatinum-selling career, including in some comic video sketches made as part of an MTV.com promotion and posted on YouTube. In one, she and JJ compare the fit of their jeans: “I told you those `fat-free' dog treats weren't fat-free,” she scolds. She also regularly chronicles her dogs' doings on her Twitter feed, from Cha-Cha urinating on her dressing room floor and jumping on her last September to Dolomite stealing her underwear out of a suitcase while she was vacationing in March.